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AS 2784-2002 Endless wedge belt and V-belt drives

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                                                                                                                                       AS 2784




                                                                                                                Australian Standard™


                                                                         Endless wedge belt and V-belt drives
                                                                                                                                                 AS 2784—2002
                                                                                           This Australian Standard was prepared by Committee ME-024, V-belt Drives. It
                                                                                           was approved on behalf of the Council of Standards Australia on 31 July 2002 and
                                                                                           published on 15 August 2002.




                                                                                           The following are represented on Committee ME-024:
                                                                                             Australian Chamber of Commerce and Industry
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                                                                                             Department of Mineral Resources, NSW




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                                                                                           Executive, Standards Australia International Ltd, GPO Box 5420, Sydney, NSW
                                                                                           2001.




                                                                                                   This Standard was issued in draft form for comment as DR 01378.
                                                                                                                                                               AS 2784—2002




                                                                                           Australian Standard™
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                                                                                           Endless wedge belt and V-belt drives




                                                                                           Originated as AS B243—1967, AS B241—1968 and AS 1916—1977.
                                                                                           Previous edition AS 2784—1985.
                                                                                           Second edition 2002.




                                                                                           COPYRIGHT
                                                                                           © Standards Australia International
                                                                                           All rights are reserved. No part of this work may be reproduced or copied in any form or by any
                                                                                           means, electronic or mechanical, including photocopying, without the written permission of the
                                                                                           publisher.
                                                                                           Published by Standards Australia International Ltd
                                                                                           GPO Box 5420, Sydney, NSW 2001, Australia
                                                                                           ISBN 0 7337 4743 4
                                                                                           AS 2784—2002                                        2




                                                                                                                                         PREFACE
                                                                                                This Standard was prepared by the Standards Australia Committee ME-024, V-belt Drives,
                                                                                                to supersede AS 2784—1985.
                                                                                                The objective of this Standard is to rationalize the range of endless wedge belts, V-belts and
                                                                                                associated pulleys to facilitate correct initial selection and use of the belts and pulleys and
                                                                                                to assist users in selection of replacement components for existing belt drives.
                                                                                                The format and much of the material in this Standard closely follows BS 3790:1995,
                                                                                                Specification for endless wedge belt drives and endless V-belt drives and acknowledgement
                                                                                                is made thereto.
                                                                                                The major differences between this Standard and the previous edition are as follows:
                                                                                                (a)   Pulley side wobble and run out tolerances have been halved to match BS 3790.
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                                                                                                (b)   Addition of a centre distance variation requirement and test procedure to check for
                                                                                                      irregular running of V-belt drives arising from non-uniformities in the V-belt
                                                                                                      sections.
                                                                                                (c)   Alignment of the test method for electrical resistance with ISO 1813:1998.
                                                                                                (d)   Inclusion of the power rating calculations from ISO 5292:1995 (and BS 3790), in
                                                                                                      addition to retention of the Tables of power ratings for belts of common construction
                                                                                                      types and materials.
                                                                                                (e)   Incorporation of a test method for the tension in a belt using two different deflections
                                                                                                      depending on the span length of the belt to improve the ease of measurement of
                                                                                                      deflections.
                                                                                                The test method for the electrical resistance of a belt is at variance to BS 3790. BS 3790
                                                                                                strains the belt prior to the determination of electrical resistance whereas this Standard now
                                                                                                tests the belt without straining it, in accordance with the method in ISO 1813.
                                                                                                Belts of E and SPP sections, are not included in this Standard, owing to lack of demand for
                                                                                                these sections in Australia.
                                                                                                Attention is drawn to the fact that this Standard does not contain dynamometer test or any
                                                                                                other performance test data regarding power transmission.
                                                                                                The power ratings provided in Appendix A (Tables A2 to A11) are based on formulas in
                                                                                                ISO 5292.
                                                                                                This Standard is in broad agreement with the following ISO Standards:
                                                                                                   ISO 155     Belt drives— Pulleys—Limiting values for adjustment of centres
                                                                                                   ISO 254     Belt drives—Pulleys—Quality, finish and balance
                                                                                                   ISO 1081    Belt drives—V-belts and V-ribbed belts and corresponding grooved
                                                                                                               pulleys—Vocabulary
                                                                                                   ISO 1813    Belt drives—V-ribbed belts, joined V-belts and V-belts including wide
                                                                                                               section belts and hexagonal belts—Electrical conductivity of antistatic
                                                                                                               belts: Characteristics and methods of test
                                                                                                   ISO 4183    Belt drives—Classical and narrow V-belts—Grooved pulleys (system
                                                                                                               based on datum width)
                                                                                                   ISO 4184    Belt drives—Classical and narrow V-belts—Lengths in datum system
                                                                                                   ISO 5292    Belt drives—V-belts and V-ribbed belts—Calculation of power ratings
                                                                                                                                        3                                       AS 2784—2002



                                                                                             ISO 9608    V-belts—Uniformity of belts—Test method for determination of centre
                                                                                                         distance variation
                                                                                           While based on the listed ISO and British Standards, this Standard is not equivalent as it
                                                                                           does not cover belts for the automotive industry. Major editorial changes to the text of the
                                                                                           ISO Standards have also been made to combine the relevant requirements and test methods
                                                                                           from several of these to suit the less diverse needs of the Australian V-belt market.
                                                                                           The terms ‘normative’ and ‘informative’ have been used in this Standard to define the
                                                                                           application of the appendix to which they apply. A ‘normative’ appendix is an integral part
                                                                                           of a Standard, whereas an ‘informative’ appendix is only for information and guidance.
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                                                                                           AS 2784—2002                                                           4




                                                                                                                                                         CONTENTS

                                                                                                                                                                                                                              Page

                                                                                                SECTION 1 SCOPE AND GENERAL
                                                                                                  1.1 SCOPE......................................................................................................................... 5
                                                                                                  1.2 REFERENCED DOCUMENTS................................................................................... 5
                                                                                                  1.3 DEFINITIONS............................................................................................................. 5

                                                                                                SECTION 2 BELTS
                                                                                                  2.1 GENERAL................................................................................................................... 9
                                                                                                  2.2 MATERIALS AND WORKMANSHIP ....................................................................... 9
                                                                                                  2.3 CROSS-SECTION DIMENSIONS .............................................................................. 9
                                                                                                  2.4 DETERMINATION OF BELT PITCH LENGTH ....................................................... 9
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                                                                                                  2.5 CENTRE DISTANCE VARIATION ........................................................................... 9
                                                                                                  2.6 MATCHED BELTS................................................................................................... 12
                                                                                                  2.7 BELT FITTING ......................................................................................................... 12
                                                                                                  2.8 ANTISTATIC BELTS ............................................................................................... 15
                                                                                                  2.9 FIRE-RESISTANT BELTS ....................................................................................... 16
                                                                                                  2.10 MARKING ................................................................................................................ 16

                                                                                                SECTION 3 PULLEYS
                                                                                                  3.1 MATERIALS............................................................................................................. 17
                                                                                                  3.2 SURFACE FINISH.................................................................................................... 17
                                                                                                  3.3 TOLERANCES ......................................................................................................... 17
                                                                                                  3.4 BALANCING ............................................................................................................ 17
                                                                                                  3.5 STANDARD DIMENSIONS OF PULLEYS............................................................. 19
                                                                                                  3.6 INSTALLATION AND TAKE-UP ALLOWANCES................................................ 19



                                                                                                APPENDICES
                                                                                                  A   RECOMMENDATIONS FOR WEDGE BELT AND V-BELT DRIVE DESIGN ..... 24
                                                                                                  B   RECOMMENDED PRACTICE FOR TENSIONING BELT DRIVES DURING
                                                                                                      INSTALLATION AND CALCULATION OF THE RESULTANT FORCE
                                                                                                      IMPOSED ON THE SHAFT ..................................................................................... 55
                                                                                                  C   STORAGE OF BELTS .............................................................................................. 59
                                                                                                  D   DETERMINATION OF ELECTRICAL RESISTANCE OF BELTS......................... 60
                                                                                                  E   DETERMINATION OF FIRE-RESISTANCE PROPERTIES OF BELTS................ 67
                                                                                                  F   EXAMPLES OF INDICATION OF TOLERANCE ON PITCH LENGTH ............... 70
                                                                                                                                                 5                                        AS 2784—2002




                                                                                                                                 STANDARDS AUSTRALIA

                                                                                                                                     Australian Standard
                                                                                                                         Endless wedge belt and V-belt drives



                                                                                                            S EC TION            1      S C OP E        AND       G E NER A L

                                                                                                 1.1 SCOPE
                                                                                                 This Standard specifies the dimensions and certain other properties of endless wedge belts
                                                                                                 and V-belts and their corresponding grooved pulleys for power transmission. Additional
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                                                                                                 requirements are included for antistatic belts and fire-resistant belts.
                                                                                                   NOTES:
                                                                                                   1    Recommended power ratings for belts and information on the design, selection and
                                                                                                        installation of drive assemblies are given in Appendices A and B.
                                                                                                   2    Recommendations on the storage of belts are provided in Appendix C.
                                                                                                 This Standard does not apply to industrial variable speed drives employing pulleys with
                                                                                                 movable flanges.
                                                                                                   NOTE: For belts for automotive use, additional requirements may apply. Industry standards
                                                                                                   should be consulted.

                                                                                                 1.2 REFERENCED DOCUMENTS
                                                                                                 The following documents are referred to in this Standard:
                                                                                                 AS
                                                                                                 3709    Vibration and shock—Balance quality of rotating rigid bodies
                                                                                                 ISO
                                                                                                 340     Conveyor belts—Flame retardation—Specifications and test method
                                                                                                 4287    Geometrical Product Specifications (GPS)—Surface texture: Profile method—
                                                                                                         Terms, definitions and surface texture parameters

                                                                                                 1.3 DEFINITIONS
                                                                                                 For the purpose of this Standard, the following definitions apply:
                                                                                                                        α
                                                                                                 1.3.1 Angle of a belt (α)
                                                                                                 The included angle obtained by extending the sides of the belt (see Figure 1).
                                                                                                                               α
                                                                                                 1.3.2 Angle of pulley groove (α)
                                                                                                 The angle included by the sides of the groove cross-section.
                                                                                                   NOTE: For any given profile, the pulley groove angle may have several different values
                                                                                                   depending upon the pulley diameter (see Table 8).
                                                                                                 1.3.3 Antistatic belt
                                                                                                 A belt that has an electrical resistance that does not exceed a specified maximum (see
                                                                                                 Clause 2.8).
                                                                                                 1.3.4 Effective diameter of pulley (d e )
                                                                                                 The diameter of the pulley at the effective width of the pulley groove (see Figure 2).

                                                                                           www.standards.com.au                                                                   © Standards Australia
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                                                                                                             AS 2784-2002, Endless wedge belt and V-belt
                                                                                                             drives
This is a free 7 page sample. Access the full version at http://infostore.saiglobal.com.




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